Extruded Polystyrene (XPS)
Aged R-Value for XPS = 5.0 per inch XPS SIPs are available in 4′ and 8′ widths with lengths up to 24′. XPS is the best choice when you need a thin strong SIP with a high insulation value. XPS has lower permeability and can be used in any of our SIP products. Nailbase Panel with Extruded Polystyrene (XPS) Core Nailbase Panel with Extruded Polystyrene (XPS) Core While we do not have the third party documentation of its structural properties, our internal testing has proven that it is much stronger than EPS. XPS cores come in specific thicknesses which can laminated together to create a variety of SIP thicknesses. 3″, 4.5″, 6.5″, 8.25″, 10.25″, and 12.25″ are common XPS SIP thicknesses that we manufacture.